Exhaust device for internal-combustion engines.



H. F. LOOMIS.

EXHAUST DEVICE FOR INTERNAL comsusnow ENGINES.

APPUCATION F ILED NOV. 14, I911.

Patented Dec. 3, 1918.

- To all whom itmay concern:

UNITED YsT rns PATENT. orrron.

HENRY F. LOOMIS, OF READING, PENNSYLVANIA.

nxmusr nnvrcn F03 rnrnmieL-comensrron racemes.-

Be it known that I, HENRY F. I oomi a citizen of the United States, residing, at Reading, in the county of Berks and State of Pennsylvania, have invented certain new" and useful Improvements in Exhaust Devices for Internal-Combustion Engines, of n which the following is a specification.

My invention relates to means for facilitating the discharge of exhaust gases from internal combustion engines and particularly where the exhaust is bafiled or inuflied to reduce the noise ,of the exploslon in the engine cylinders. My device, while applicable to all internal combustion. motor vehicles, is particularly useful in aeroplanes.

Heretofore aeroplane engines have not been mufiled, as the back pressure exerted by the muffler on the cylinders has materially reduced the power so as to be decidedly objectionable. My, device comprises means for; causing suction at the discharge end of'the exhaust conduit to more quickly free said conduit after each cylinder explosion and reduce or prevent back pressure. This suction device may be a plied at the discharge end of any well known type of mufiier, but is preferably employed in connection with my spirally arranged bafiieiflates located within the exhaust conduit. y invention is fully described in connection with the accompanying drawings and the novel features are pointed out in the claims.

Figure 1 is a perspective view'of an aeroplane having my inventionapplied thereto.

Fig. 2 is a longitudinal sectional elevation of the dischar e endof an exhaust conduit showin a pre erred application of my spiral be e plates and air-driven suction fan;

Fig. 3 is a cross-sectional view on the line 33 ofi'Fig. v2, looking in the direction of the arrow.

Fig.4 is a cross-sectional viewon the line 4-4 of Fig. 2. o 7

Fig. 5 shows a modified application of my invention. I v

The drawings shew my invention applied to an aeroplane, where the inufilingofthe discharge of the exhaust gases is particularly important, though hitherto not attempted because of the loss :ofpower to the engine. Fig. .1 indicates a conventional type of aeroplane, 1 and 2 representing the upper and lower planes respectively, 3 the body portion thereof, 4 the propeller blade, and 5 the internal combustion engine for rotating said I Specification 0! Letters Patent. Patented Dec, 3; 1918, Application filed liovember 14,1917. Serial no. 201,921.

blade. 6 is an exhaust conduit for collect ing the exhaust gases from the engine cylinders and carrying them rearward to discharge in such manner as not to interfere with the operator of the machine. I have shown this conduit raised and run over the conduit and having' radially projecting driving blades 15 which receive the full sweep ,of the air,,during flight, to rapidly rotate said fan and cause a suction of the exhaust gases through said conduit.

Figs. 2, 3 and 4 are enlarged views show ing a preferred construction of the-outlet end of the conduit 6. 10 represents 'a suction fan, axially mounted as shown on an axle 11 supported in the hub .portion'l2 of a spider frame 13 fitted to the inner wall of the conduit 6 at the outer end thereof. The fan 10 is freely rotatableon the axle 11, and is held in place by a cap 14. This simple mountingof the fan illustrates my invention, but it is understood that in practice it may be desirable to use'a different form of bearing to reduce friction and permit of the freer rotation of the fan. To rotate this fan 1 preferably employ radial extensions of the fan blades, which extensions are formed. integrally with the latter and are ofi'set, as shown, to project beyond the end of the conduit 6 and extend circumferentially around the same. These blades 15 form air contacting driving blades which are gases from the engine cylinder.

(To muffle the sounds of the engine explosions' I employ bafiie plates 16, 16, 16, 16,

within the conduit 6, which are preferably given a spiral twist as shown, to retard as little as possible the free exit of the exhaust gases and yet mufiie their noise. These bafiie plates may have varying pitches at different points in the length of the conduit to retard or advance the passage of the ,to force out of the conduit6 the exhaust gases through the conduit, and they may be erforated 1f desired, as shown at 17, to aford communication from one spiral passageway to another. Thewhirling motion given to the exhausting gases by the spiral of where the momentum is greatest. If desired, a perforated screen, not shown, may be employedat the engine end of said baflied conduit to break the initial force of theex plosion.

My exhaust suction fan may be employed, as described, in connection with the spirally a arranged baflie'plates; or it may be used m connection with any of the well known types of mufilers; or both the spiral baflle plates and suction'fan may be added to'the exhaust end of an ordinary muffler.

' Fig. shows a modified construction in .which the fan is mounted in acylinder inclosing the end of the conduit 6, the fan being driven by the passing air through said' cylinder 20, and directly acting upon the exhaust gases in conduit 6 to draw them out; in this case the air rushing through the cylinder-20 tends to draw out the air in the conduit and assists the action of the fan.

Other modifications may be readily de-- vised and I do not desire to limit myself to 7 the specific construction shown and described. And it will be readily understood also that't his device'may be applied to other.

motor driven vehicles. Y

My inventionprovides, in a simple and economical way, a mufiier that will give the maximum effect of silencing the discharge of the exploded gases, with a minimum loss of energy to the engine; and it is readily appllcable to the exhaust conduit of-any motor and reqplres 'no power from the engine to operate it.

What I claim is I 1. In combination with an internal combustion motor driven vehicl'ehaving an exbe rotated by the haust outlet, an exhaust .fan located atthe discharge end of-said outlet and adapted to passing air during motion ofthe vehicle. f 2. In combination with an internal combustion motor driven vehicle havin'gan ex haust outlet, an exhaust'fan located at the discharge end of said outlet and having extended driving blades adapted to be rotated 2y 1the passingair during motion of the vewithin said conduit and'an exhaust fan axi- '-driving blades.

3. In combination with an internal combustion motor driven vehicle having an exhaust outlet, an exhaust fan axially located in the discharge end of said outlet, and having exhaust blades-within said outlet, and exteriorly projecting air contacting driving blades.

4. In combination withan internal combustion'motor driven vehicle having'an exhaust outlet, an exhaust fan axially located in thedischarge end of said outlet, and having a conical spreader head andexhaust blades within said outlet, and exteriorly projectinlg air contacting driving blades.

5. n combination with an internal combustion motor driven vehicle having an 'exhaust outlet, a spider frame within the discharge end of said outlet, an exhaust fan axially mounted within said spider'frame, and having exteriorly projecting air contacting driving blades.

-6. In combination with'aninternal combustion motor driven vehicle having an exhaust conduit provided with a mufiler, an exhaust fan located at the discharge end of said muffler and adapted to be rotated by the passing air during motion of the vehicle.

7. In CQIIlblIlfltlOIhWlfh an internal combustion motor driven vehicle having an exhaust conduit, bafiie plates within said conduit and an egzhaust fan located at the discharge end thereof, said fan having air contacting driving blades.

8. In combination with an internal combustion motor driven vehiclehavin an ex" haust conduit, spirally arranged ba e plates within said conduit and an exhaust fan located at the discharge end'thereof, said fan having air contacting driving blades.

9. In combination with an internal combustion motor-driven vehicle havin an exhaust conduit, spirally arranged ba e plates ally mounted in the discharge end thereof, said fan having exteriorly/ projecting .air contacting drivingblades. l T i 10. In an aeroplane having an internal combustion propeller-driving engine, an exhaust ,conduit from said engine extended rearward over a plane t ereof, spirally arranged baflie plates within said conduit and an exhaust fan at the discharge end thereof, having radially extending air acontacting In testimonywhereof I aifixmysignature.

HENRY n-no o is. 

